Responsive frameworks in web design are crucial for ensuring that websites adapt seamlessly to various screen sizes and devices. This adaptability improves the user experience by providing consistent functionality and accessible interface, regardless of whether users are on a desktop, tablet, or smartphone. Frameworks like Bootstrap and Foundation incorporate grid systems and flexible layouts, enabling developers to create fluid designs efficiently. Additionally, responsive design positively impacts SEO rankings, as search engines prioritize mobile-friendly sites. Overall, responsive frameworks enhance accessibility, improve site performance, and lead to better customer engagement in an increasingly mobile-centric digital landscape.